Air Cooled Heat Exchanger/Air Cooler
---Introduction
An Air Cooled Heat Exchanger (ACHE) is a thermal exchange device that uses air as the cooling medium to cool or condense process fluids through forced or natural convection. Its core principle involves using fans to drive airflow through finned tube bundles,enabling heat exchange between the air and high-temperature fluid inside the tubes. Heat is transferred from the fluid to the air via the tube walls and fins, ultimately dissipating into the atmosphere.
---Application Industries
Air coolers are widely used in the following sectors:
- Petrochemical Industry: Cooling reaction products, oil-gas condensation, light
hydrocarbon recovery, etc.
- Power Industry: Gas turbine inlet air cooling, steam condensation, and circulating
water cooling.
- Metallurgical Industry: Blast furnace circulating water cooling, steel rolling process cooling.
- Coal Chemical Industry: Gas cooling in coal gasification processes.
- Pharmaceutical and Food Industries: Cooling process media and applications requiring clean environments.
---Structure and Configuration Features
Air coolers primarily consist of the following components:
- Tube Bundles: Core heat transfer units composed of finned tubes, headers, and frames.
- Fan System: Provides airflow for heat dissipation.
- Support Structure: Steel framework supporting tube bundles and fans.
- Louvers (Optional): Adjust air volume.
---Structural Classification:
*Horizontal type: Tube bundles arranged horizontally, air flows vertically,
suitable for conventional cooling.
*Sloped roof type (V-shaped): Tube bundles arranged in a V-shaped
inclination, space-saving, commonly used for high-flow condensation.
*Vertical type: Air flows horizontally.
*Modular type: Multiple tube bundles in parallel configuration, adaptable to complex operating conditions.
---Detailed explanation of main components
- Header
The header is a critical
component that connects finned tubes and distributes fluid. Common configurations include:
·Threaded plug-type header: The removable threaded plugs allow for easy maintenance, making it the most widely used configuration.
·Removable header: Features a flange connection that allows the tube bundle to
be separated from the header, enabling convenient maintenance.
·Manifold-type header: Primarily used in high-pressure applications. Utilizes partition baffles to achieve a multi-pass design.
2. Finned Tubes
Finned tubes are core components for enhanced heat transfer. Common types include:
L/DR/KL/G Types.
3.Fan System
*Fan Types: Axial fan: High airflow volume, low energy consumption.
*Drive Methods:
-Direct motor drive (compact design, high efficiency).
-Belt drive (adjustable speed, low maintenance cost).
-Gearbox drive(Consider for use when power ≥45kW or based on customer requirements.)
*Control Methods:
-Frequency conversion speed regulation: Precise airflow control, energy-saving.
-Adjustable fan blades: Manual or automatic tilt angle adjustment.
4. Structure
-Materials: Carbon steel (standard), stainless steel.
-Design Features:Modular structure for easy transportation and on-site assembly.
-Maintenance platforms and ladders compliant with safety standards.
-Seismic-resistant design.
5. Auxiliary Components(Optional)
· -Louvers:Automatic or manual airflow adjustment, prevents rain/snow ingress.
·-Spray system: Enhances cooling efficiency via water spraying during high-temperature seasons.
6.Advantages and Limitations
·Advantages:
-Water-saving and eco-friendly (no water dependency).
-Adaptable to high temperatures, high pressure, and corrosive media.
-Low maintenance cost, long service life.
·Limitations:
-Significantly affected by ambient temperature.
-Large footprint requires optimized layout
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